Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Study on Acoustical Radiation from Simplified Systems of a Dash Structure for NVH Performance

자동차 대시 구조의 소음진동 성능개선을 위한 단순 상사구조물의 소음방사성능 연구

  • 임차섭 (현대자동차 기능시험1팀) ;
  • 유지우 (현대기아자동차 해석기술팀) ;
  • 박철민 (현대자동차 해석기술팀) ;
  • 조진호 (NVH Korea(주) 시험평가팀)
  • Received : 2010.07.22
  • Accepted : 2010.10.04
  • Published : 2010.10.20
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Abstract

A dash panel plays an important role to protect noise as well as heat. Meanwhile, it is also the most important path that transfers energy to the interior cavity, so that some of noises are transferred via air and its structural vibration becomes a major issue. From the viewpoint of NVH performance, simplified structures analogues to the dash wall are dealt with. Stiffeners, damping sheets and sound packages attached to a flat panel are taken into account as design variables. Structural radiation characteristics(thus, structure borne) such as radiation efficiency and radiation power are mainly discussed. For the case when an excitation is applied on a frame that surrounds the panel, it is shown that the radiation efficiency increases by attaching a stiffener to the panel, which is similarly found from the case when a panel is directly excited. It seems more effective to attach damping sheets along the boundary area of the panel rather than its middle area. The radiation efficiency of sound packages may make a dominant contribution to transmission loss as well as sound radiation. Experimental work was carried out to verify the results based on the simulation study.

Keywords

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Cited by

  1. Evaluation of Design Variables to Improve Sound Radiation and Transmission Loss Performances of a Dash Panel Component of an Automotive Vehicle vol.22, pp.1, 2012, https://doi.org/10.5050/KSNVE.2012.22.1.022